JP2733499B2 - thermostat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed plate provided with a fixed contact, a movable plate provided with a movable contact, and deformed when the temperature becomes higher than a predetermined temperature, thereby deforming the movable plate. And a thermostat including a bimetal for opening and closing the movable contact. In particular, it relates to the structure of a movable plate of such a thermostat.

[0002]

2. Description of the Related Art FIG. 9 is a sectional view of an example of a thermostat according to the prior art. The current passes through a circuit passing through one lead wire 1, the movable plate 2, the movable contact 3 provided on the movable plate, the fixed contact 4, the fixed plate 5 provided with the fixed contact, and the other lead wire 6. When the temperature of the bimetal plate 7 rises, the bending direction of the bimetal plate reverses. As a result, the movable plate 2 is deformed, the movable contact 3 separates from the fixed contact 4, and the current is cut off. This thermostat is made as follows.

A fixing plate 5 whose plan view is shown in FIG. 10 is embedded in a joining member 8 made of a synthetic resin. The joining member 8 has two columnar portions 10.

A columnar portion 10 is passed through two holes 2a of the movable plate 2 whose plan view is shown in FIG. 11, and a columnar portion is inserted into two holes 7a of the bimetal plate 7 whose plan view is shown in FIG. 10, the columnar portion 10 is passed through a hole of a fixing member 12 made of synthetic resin, and the head of the columnar portion 10 is melted, and the movable plate 2, the bimetal plate 7 and the fixing member 12 are joined to each other. Fixed to.

After these necessary lead wires 1 and 6 joined by the joining member 8 are connected, they are put into a housing 13 and an inlet portion is sealed by a resin 14.

The thermostat is required to have various characteristics. For example, it is preferable that the amount of internal heat generated can be adjusted by changing the internal resistance and the like. Therefore, in the prior art, these requirements are satisfied by adjusting the material and dimensions of the movable plate.

[0007]

Since the movable plate basically requires conductivity and elasticity, it is difficult to use the movable plate for adjusting the amount of heat generated.

Further, when the fixing member 12 is formed of a synthetic resin, contaminants adhere to the synthetic resin due to static electricity and may be carried into the housing. And this contaminant causes insulation failure.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a thermostat that can adjust the internal resistance and the like and that uses less synthetic resin.

[0010]

The object of the present invention is to provide first and second terminals connected to an external circuit, and a fixed plate having a second terminal fixed at one end and a fixed contact provided at the other end. A movable plate provided with a movable contact at a position corresponding to the fixed contact and having a through hole at the other end and directly or indirectly connected to the first terminal; A bimetal plate having a through-hole at the other end thereof, a joining member having the columnar portion embedded with the fixing plate, and a fixing auxiliary member having a through-hole; the movable plate, the bimetal plate, The fixing auxiliary member is fixed to the joining member by the columnar portion penetrating those through holes, and when the temperature exceeds a set temperature, the shape of the bimetal plate changes, and the movable plate is deformed by the deformation of the bimetal plate, whereby Open between the fixed contact and movable contact In the thermostat, the fixing auxiliary member is formed by bending a metal plate having at least a pair of holes having different diameters so that the pair of holes overlap, and the smaller diameter of the hole faces the bimetal plate. Solved by a thermostat characterized by being arranged in a thermostat.

In a preferred embodiment, a first terminal is formed by extending a part of the fixing auxiliary member, and the fixing auxiliary member, the bimetal plate, and the movable plate are spot-welded with each other near the first terminal. .

In another preferred embodiment, a part of the fixing auxiliary member is extended to form a first terminal, and the fixing auxiliary member and the bimetal plate are formed at a portion of the fixing auxiliary member remote from the first terminal. And the movable plate are spot-welded to each other, a current is caused to flow through the first terminal, the fixing auxiliary member, the bimetal plate, the movable plate, and the fixed plate, and the material and dimensions of the fixing auxiliary member are adjusted. Adjust the amount of heat generated inside the

[0013]

[Action]

(1) Since the fixing auxiliary member is made of metal, there is little adhesion of contaminants due to static electricity. (2) A single metal plate can be bent to easily form a through hole having portions with different diameters. (3) Since the fixing auxiliary member and the terminal can be made of the same member, the characteristics can be adjusted independently of the characteristics of the movable plate. That is, by adjusting the material and dimensions of the fixing auxiliary member, the amount of heat generated inside the thermostat can be adjusted. Since adjustment is not performed using a movable member as in the prior art, the degree of freedom in design is high.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings of the embodiments, members corresponding to those of the prior art are denoted by the same reference numerals, and description of those members will be omitted.

FIGS. 1, 2 and 3 show a first embodiment.
As shown in FIG. 2, the auxiliary fixing member 15 has diameters D1 and D1.
2 is formed by bending a metal plate 15a having two pairs of holes consisting of two holes 14a and 14b different from each other so that two holes having different diameters D1 and D2 overlap. Note that the two holes are not limited to a circular shape, but may have another shape, for example, a square shape. In this case, the term "diameter" in the claims is replaced with the term "hole size".

A portion of the movable plate 2 is extended to form a second terminal T
2 are formed. The bimetal plate 7 is placed on the movable plate 2, and the fixing auxiliary member 15 is further placed thereon. At this time, the fixing auxiliary member 15 is arranged such that the portion having the large diameter (D1) is far from the bimetal plate 7 and the small portion faces the bimetal plate 7.

The columnar portion 10 of the joining member 8 penetrates a hole (not shown) of the movable plate 2, a hole (not shown) of the bimetal plate 7, and a hole of the auxiliary fixing member 15 shown in FIG. , The end of the columnar portion is melted and the fixing auxiliary member 1
The hole 5 has a large diameter (D1) and is solidified.

In this embodiment, since the fixing auxiliary member 15 is made of metal, adsorption of contaminants by static electricity is small.

FIGS. 4, 5 and 6 show a second embodiment of the present invention. The auxiliary fixing member 15 is formed by bending a metal plate 15b having a shape as shown in FIG. The metal plate 15b of FIG. 5 is different from the metal plate 15a of FIG.
The only difference is that is provided.

As shown in FIG. 6, the movable plate 2, the bimetal plate 7, and the fixing auxiliary member 15 are arranged. At this time, the fixing auxiliary member 15 is arranged such that a portion (D1) of the hole of the fixing auxiliary member 15 having a large diameter is far from the bimetal plate 7. Then, the columnar portion 10 of the joining member 8 penetrates the holes of the movable plate 2, the bimetal plate 7, and the fixing auxiliary member 15.
These members are fixed to the joining member 8 by melting and solidifying the head of the columnar portion 10 in the large diameter portion of the hole of the fixing auxiliary member 15.

In this embodiment, at the X point of the second terminal T2,
The fixing auxiliary member 15, the bimetal plate 7, and the movable plate 2 are spot-welded to each other.

In this case, the amount of heat generated inside the thermostat can be adjusted by adjusting the material and size of the fixing auxiliary member 15.

FIGS. 7 and 8 show a third embodiment of the present invention. The auxiliary fixing member 15 is formed by bending a metal plate 15c having a shape as shown in FIG. Metal plate 15c of FIG.
5 is different from the metal plate 15b of FIG. 5 only in that an extension for spot welding is provided.

The arrangement of the fixing auxiliary member 15, the bimetal plate 7, and the movable plate 2 and the method of fixing the joining member 8 with the columnar portion 10 are the same as in the first and second embodiments.

In this embodiment, the fixing auxiliary member 15, the bimetal plate 7, and the movable plate 2 are spot-welded to each other at the X point of the extension.

In this case, the current is supplied to the second terminal T2, the fixing auxiliary member 15, the bimetal plate 7, the movable plate 2, the movable contact 3, the fixed contact 4, the fixed plate 5, and the second terminal T1. You can go through the circuit. Since the size of the fixing auxiliary member 15 can be increased, the amount of heat generated in the fixing auxiliary member 15 can be increased, and the amount of heat generated inside the thermostat can be easily adjusted.

Since there is no restriction on processing, metals such as brass, nickel silver, iron, stainless steel, nichrome and the like can be freely used as the material of the fixing auxiliary member.

[0028]

【The invention's effect】

(1) Since the fixing auxiliary member is made of metal, contaminants due to static electricity are prevented from being adsorbed and taken into the thermostat. (2) There was a face that it was difficult to require a larger resistance in the small shape, but because the current can flow from one end of the bent terminal to the other, a greater effect can be obtained. As in the past, similar characteristics can be realized without causing a functional failure due to heating of the movable plate at the time of an excessive current caused by increasing the resistance of the movable plate requiring spring property. Was. (3) Since a stepped hole can be formed without requiring a particularly difficult method in processing, a material can be easily selected and a processing cost can be reduced. (4) By selecting various materials for the fixing auxiliary member, the characteristics with respect to the energized current conventionally performed with the movable plate can be improved.
This can be done with the auxiliary fixing member.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of a thermostat according to the present invention.

FIG. 2 is a front view of a metal plate for forming an auxiliary member for fixing the thermostat of FIG. 1;

FIG. 3 is a perspective view showing an arrangement of a movable plate, a bimetal plate, and a fixing auxiliary member of the thermostat of FIG. 1;

FIG. 4 is a sectional view of a second embodiment of the thermostat according to the present invention. FIG. 6A is a cross-sectional view taken along line AA of FIG. 5 and a fixed contact, and FIG. 6B is a cross-sectional view taken along line BB of FIG.

FIG. 5 is a front view of a metal plate for forming an auxiliary member for fixing the thermostat of FIG. 4;

6 is a perspective view showing an arrangement of a movable plate, a bimetal plate, and a fixing auxiliary member of the thermostat shown in FIG. 4;

FIG. 7 is a front view of a metal plate for forming a fixing auxiliary member of a third embodiment of the thermostat according to the present invention.

FIG. 8 is a perspective view showing an arrangement of a movable plate, a bimetal plate, and a fixing auxiliary member of the thermostat of FIG. 7;

FIG. 9 is a sectional view of an example of a thermostat according to the related art.

FIG. 10 is a front view of a fixing plate of the thermostat of FIG. 9;

FIG. 11 is a front view of a movable plate of the thermostat of FIG. 9;

FIG. 12 is a front view of a bimetal plate of the thermostat in FIG. 9;

[Description of Signs] 2 Movable plate 3 Movable contact 4 Fixed contact 5 Fixed plate 7 Bimetal plate 8 Joint member 10 Columnar part 15 Fixing auxiliary member

Claims (3)

(57) [Claims] A first terminal connected to an external circuit, a second terminal fixed to one end and a fixed plate provided with a fixed contact at the other end, and a fixed plate provided at a position corresponding to the fixed contact. A movable plate provided with a movable contact and having a through hole at the other end and directly or indirectly connected to the first terminal; one end engaged with the movable plate near the movable contact and having a through hole at the other end; A joint member having a columnar portion in which the fixing plate is embedded, and a fixing auxiliary member having a through-hole, wherein the movable plate, the bimetal plate, and the fixing auxiliary member pass therethrough. When the temperature exceeds a set temperature, the shape of the bimetal plate changes, and the movable plate is deformed due to the deformation of the bimetal plate. The thermostat that opens and closes The fixing auxiliary member is formed by bending a metal plate having at least a pair of holes having different diameters so that the pair of holes overlap with each other, and a portion of the fixing auxiliary member having a small diameter hole faces the bimetal plate. A thermostat characterized by being arranged so that 2. A first terminal is formed by extending a part of the fixing auxiliary member, and the fixing auxiliary member, the bimetal plate, and the movable plate are spot-welded to each other in the vicinity of the first terminal. Characteristic thermostat. 3. A first terminal is formed by extending a part of the fixing auxiliary member, and the fixing auxiliary member, the bimetal plate, and the movable plate are separated from each other at a portion of the fixing auxiliary member far from the first terminal. Heat is generated by spot welding, and the current flows through the first terminal, the fixing auxiliary member, the bimetal plate, the movable plate, and the fixed plate, and the material and dimensions of the fixing auxiliary member are adjusted to generate heat inside the thermostat. Thermostat characterized by adjusting etc.